| 1″ (25mm) Ceramic dome, Ferrofluid-cooled in an acoustic back chamber | Two 1″ (25mm) Ceramic domes, Ferrofluid-cooled | 1″ (25mm) Ceramic dome, Ferrofluid-cooled in an acoustic back chamber | Two 1″ (25mm) Ceramic domes, Ferrofluid-cooled |
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| 5 1/4″ (133mm) Carbon fiber/Rohacell laminated cone with a rubber surround | Two 3″ (76mm) Carbon fiber/Rohacell laminated cones with rubber surrounds | 5 1/4″ (133mm) Carbon fiber/Rohacell laminated cone with a rubber surround | Two 3″ (76mm) Carbon fiber/Rohacell laminated cones with rubber surrounds |
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| Four 5 1/4″ (133mm) Carbon fiber/Rohacell laminated cones with rubber surrounds | Four 5 1/4″ (133mm) Carbon fiber/Rohacell laminated cones with rubber surrounds | Two 5 1/4″ (133mm) Carbon fiber/Rohacell laminated cones with rubber surrounds | Two 5 1/4″ (133mm) Carbon fiber/Rohacell laminated cones with rubber surrounds |
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| 6 ohms nominal; 4 ohms minimum | 6 ohms nominal; 4 ohms minimum | 8 ohms nominal; 6 ohms minimum | 8 ohms nominal; 6 ohms minimum |
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| 5 watts minimum; 200 watts maximum | 5 watts minimum; 200 watts maximum | 5 watts minimum; 150 watts maximum | 5 watts minimum; 150 watts maximum |
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| 8 7/8″ x 34 7/8″ (225mm x 886mm) | 8 7/8″ x 34 7/8″ (225mm x 886mm) | 8 7/8″ x 21 3/4″ (225mm x 553mm) | 8 7/8″ x 21 3/4″ (225mm x 553mm) |
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| 7 1/2″ x 33 1/2″ (191mm x 851mm) | 7 1/2″ x 33 1/2″ (191mm x 851mm) | 7 1/2″ x 20 1/2″ (191mm x 521mm) | 7 1/2″ x 20 1/2″ (191mm x 521mm) |
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